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- The contact data must be cleaned: Adress must be correst, duplicated must be removed, older data must be deleted
- The structure types, if any, must have been defined (see XXX Define criteria’s for the contacts)
- The criteria and criterion elements must have been defined (see XXX Define type of structure)
- Each contact has a contact number. New contact must have new contact numbers. A specific range is reserved for existing contact numbers (How to know this range ? SecuTix or tzhe customer atgive contact number ?).
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